関連する実験動画
Updated: Jun 26, 2026

11:00
Determination of the Gas-phase Acidities of Oligopeptides
Published on: June 24, 2013
フェムト秒レーザーで誘発された陽子ペプチドのイオン化/解離
Christine L Kalcic1, Tissa C Gunaratne, A Daniel Jones
1Department of Chemistry, Michigan State University, East Lansing, Michigan 48824, USA.
Journal of the American Chemical Society
|January 9, 2009
まとめ
新しい超短レーザーパルスにより,ペプチドとタンパク質の分析のためのタンデム質量スペクトロメトリが強化されています. この新しいイオン活性化方法は,高度なタンパク質研究のために,より大きな配列情報と選択的断片制御を提供します.
科学分野:
- プロテオミクス プロテオミクスは,プロテオミクスの
- アナリティカル・ケミストリー (Analytical Chemistry) とは
- バイオフィジックス 生物物理学
背景:
- タンデム質量スペクトロメトリは,ペプチドとタンパク質の識別と特徴づけに不可欠です.
- 質量スペクトロメトリーにおけるイオン活性化の現在の方法は,包括的な配列情報を得ることの限界があります.
- プロテオーム解析の進歩は,制御された断片化によるイオン活性化技術の改善を必要とする.
研究 の 目的:
- 超短時間のレーザーパルスを使った新しいイオン活性化方法を導入し,評価する.
- 現在の質量スペクトロメトリー技術の限界を克服するためのこの方法の有用性を実証する.
- タンパク質とペプチドの分析における重要な課題に対する解決策を探求する.
主な方法:
- イオン活性化のために超短時間のレーザーパルス (約30フェムト秒) を利用した.
- この新しい方法を,タンデム質量スペクトロメトリの文脈で適用しました.
- その結果生じるペプチドとタンパク質の断片化パターンを調査した.
主要な成果:
- この新しいイオン活性化方法は,ペプチドとタンパク質の分析において有用性を示した.
- ウルトラショートレーザーパルスにより,既存の技術と比較して,より多くのシーケンス情報が得られました.
- 断片化化学に対する選択的制御が観察されました.
結論:
- ウルトラショートレーザーパルスアクティベーションは,質量スペクトロメトリーにおける重要な進歩を表しています.
- この方法は,プロテオーム解析における現在の限界を克服する有望な方法である.
- この技術は,タンパク質とペプチドの詳細な構造的特徴化のための新しい道を開きます.
関連する概念動画
Peptide Identification Using Tandem Mass Spectrometry
Tandem mass spectrometry, also known as MS/MS or MS2, is an analytical technique that employs two mass analyzers. Essentially it is a series of mass spectrometers that helps isolate a particular biomolecule and then helps study its chemical properties.
This technique helps gather information regarding the protein from which the peptide was obtained and to study the peptides’ amino acid sequence. Identifying peptides from a complex mixture is an important component of the growing field of...
This technique helps gather information regarding the protein from which the peptide was obtained and to study the peptides’ amino acid sequence. Identifying peptides from a complex mixture is an important component of the growing field of...
Chemical Ionization (CI) Mass Spectrometry
The molecular ion peak of a molecule in the mass spectrum provides vital information for molecular identification. However, conventional electron impact ionization can lead to the rapid dissociation of some molecular ions before they reach the detector. A milder ionization method is required to increase the lifetime of such ionized analyte molecules. Chemical ionization (CI) is a gas-phase protonation reaction useful for mass-analyzing analyte molecules that are easily protonated to yield the...
Matrix-Assisted Laser Desorption Ionization (MALDI)
Matrix-assisted laser desorption ionization (MALDI) is a powerful analytical technique used in mass spectrometry. It enables the identification and characterization of various biomolecules, including proteins, peptides, nucleic acids, and carbohydrates. MALDI is an ionization technique, widely employed in biological and medical research, as well as in fields like pharmacology and biochemistry.The analyte of interest, a biomolecule or a mixture of biomolecules, is mixed with a suitable matrix...
MALDI-TOF Mass Spectrometry
Mass spectrometry is a powerful characterization technique that can identify and separate a wide variety of compounds ranging from chemical to biological entities, based on their mass-to-charge ratio (m/z). The instruments that allow this detection, known as mass spectrometers, have three components: an ion source, a mass analyzer, and a detector. These spectrometers differ based on the nature of their ion source and analyzers.Matrix-assisted laser desorption ionization (MALDI) is a commonly...
Mass Spectrometry: Molecular Fragmentation Overview
The ionization of a molecule into a molecular ion inside the mass spectrometer causes instability in the molecule's structure due to the loss of an electron. This eventually leads to the fragmentation or breaking of some bonds in the molecule. The fragmentation occurs predominantly at specific bonds to yield relatively stable fragments.
One type of fragmentation pattern is the cleavage of a single bond in the molecular ion. The cleavage leads to a radical and a cation. The cleavage can occur at...
One type of fragmentation pattern is the cleavage of a single bond in the molecular ion. The cleavage leads to a radical and a cation. The cleavage can occur at...
Mass Spectrometry: Carboxylic Acid, Ester, and Amide Fragmentation
The fragmentation patterns observed for compounds such as carboxylic acids, esters, and amides in the mass spectra include ⍺-cleavage and McLafferty rearrangement. Fragmentation by ⍺-cleavage preferentially occurs at the carbon-carbon bond at the ⍺-position next to the carboxylic group to generate a neutral radical and a cation. Long chain compounds with hydrogen at their γ-carbon undergo McLafferty rearrangement to give a radical cation and a neutral alkene.
For example, the fragmentation of...
For example, the fragmentation of...

